[et-mgmt-tools] FYI: Some virtinst code reorganization

[Cole Robinson]

Hi all,

Just a heads up that I committed some changes to virtinst that
reorganize the code a bit, breaking some classes out into their own
files. The changes are:

>From Guest.py:
  Break out VirtualAudio to VirtualAudio.py
  Break out VirtualGraphics to VirtualGraphics.py
  Break out VirtualNetworkInterface to VirtualNetworkInterface.py
  Break out Installer to Installer.py

>From DistroManager.py:
  Break out PXEInstaller to PXEInstaller.py
  Move distro fetch helpers to OSDistro

Rename DistroManager.py to DistroInstaller.py

Hopefully it doesn't cause any headaches. It's immediately nicer when
trying to alter the bigger classes like Guest, Installer, and
DistroInstaller.

Thanks,
Cole